Experimental observation of guanine tautomers with VUV photoionization

Journal Article · Mon Dec 01 00:00:00 EST 2008 · Journal of Physical Chemistry A

OSTI ID:945363

Zhou, Jia; Kostko, Oleg; Nicolas, Christophe; Tang, Xiaonan; Belau, Leonid; de Vries, Mattanjah S; Ahmed, Musahid

Two methods of preparing guanine in the gas phase, thermal vaporization and laser desorption, have been investigated. The guanine generated by each method is entrained in a molecular beam, single photon ionized with tunable VUV synchrotron radiation, and analyzed using reflectron mass spectrometry. The recorded photoionization efficiency (PIE) curves show a dramatic difference for experiments performed via thermal vaporization compared to laser desorption. The calculated vertical and adiabatic ionization energies for the eight lowest lying tautomers of guanine suggest the experimental observations arise from different tautomers being populated in the two different experimental methods.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Chemical Sciences Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 945363
• Report Number(s): LBNL-1330E; TRN: US0900819
• Journal Information: Journal of Physical Chemistry A, Journal Name: Journal of Physical Chemistry A
• Country of Publication: United States
• Language: English

Related Subjects

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DESORPTION
EFFICIENCY
EVAPORATION
GUANINE
IONIZATION
LASERS
MASS SPECTROSCOPY
MOLECULAR BEAMS
PHOTOIONIZATION
PHOTONS
SYNCHROTRON RADIATION
guanine
tautomers
VUV
photoionization